Chlorination reaction of gibbsite and its thermal decomposition products with carbon tetrachloride

Autor:	Tamas Szekely, T. Hauthal, G. Mink, G. Blumenthal, I.S. Pap
Rok vydání:	1990
Předmět:	Boehmite Inorganic chemistry Thermal decomposition Condensed Matter Physics Isothermal process Thermogravimetry Reaction rate chemistry.chemical_compound chemistry polycyclic compounds Carbon tetrachloride Physical and Theoretical Chemistry Phosgene Instrumentation Gibbsite
Zdroj:	Thermochimica Acta. 167:79-89
ISSN:	0040-6031
DOI:	10.1016/0040-6031(90)80467-d
Popis:	The chlorination of gibbsite and its partially dehydroxylated derivates with gaseous CCl 4 was studied by thermogravimetry. A promoting influence of the surface hydroxyls on the chlorination mechanism has been observed and compared with that found in the case of chlorination by COC1 2 . The kinetic features of the reaction of CC1 4 with alumina samples containing various amounts of surface hydroxyls have been determined by isothermal TG measurements in the temperature range 650–820 K. The highest initial reaction rates were observed on partially dehydroxylated samples prepared from gibbsite at 670 K. In the course of chlorination, however, at about 70% conversion, a recrystallization of the solid occurs leaving behind boehmite and aluminas of much less reactivity, as was similarly observed previously in the chlorination by phosgene.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f6d2329ea5a55b4123693388b1e1229a https://doi.org/10.1016/0040-6031(90)80467-d Zobrazit plný text záznamu